Lecture 12 Flashcards
bonds
localised interactions that hold a structure together
bond direction
dictates the shape that things adopt
bond strength
measure of how hard it is to break a bond, energy is needed to break a bond
matter
all matter is held together by bonds, changing the bond type changes its properties
solid
strong bonds, short range, complex networks in 3D that hold things in place
lots of bonds need to be broken to remove individual components
ordered
crystalline
disordered
amorphous
liquid
less bonds, weaker
bonds are held close together but no directionality or cooperation
molecules and atoms can slide, making bonds with molecules
gas
nothing bonds to anything else, free motionp
phase changes
the conversion from one phase to another
bonds are broken because energy (heat) is added
ionic solids
rigid 3D network
moving the ions can disrupt many long range bonds
hard, high melting, brittle
insulators, don’t conduct electricity
covalent networks
rigid 3D and 2D networks
hard, high melting, brittle
insulators
metals
metallic bonding
hard (strong bonds)
ductile (atoms slide but maintain bonding)
conduct electricity
intramolecular
strong covalent bonds inside molecules
intermolecular
van der waals and hydrogen bonding between molecules